Cisco WAN :: 3845 / 7206 / 6513 - EIGRP Multicast Failure Unidirectional
Mar 21, 2011
This issue is a bit confounding for me, but hopefully simple for one of you. I have two sites, one in Alaska and one in California, connected via 10mb QinQ service from an ISP in Alaska. The ISP is utilizing Verizon from Seattle south who is delivering the circuit on a DS3 here in California. The ISP gear on site here is a Tasman. The Tasman is directly connected to a Cisco 3845 G0/1 with a routing sub interface. In Alaska, the ISP is directly connected to a 6513 which in turn is connected to a 7206 with a routing sub interface. I cannot seem to get the 7206 and 3845 to come up as neighbors.
The 7206 receives the 3845's Hello and the 7206 shows the 3845 as a neighbor until the hold time expires. It does not see updates from the 3845 since the 3845 never sees a Hello from the 7206 and comes up as a neighbor to send an update. The 3845 does see EIGRP updates from the 7206, but no Hello. Pinging 224.0.0.10 from the 7206 does not get a response from the 3845, but it does get a response from many other sites/neighbors, including another site here in California with a nearly identical setup (same provider and gear). I am ableto ping between the devices' routing interfaces. Being QinQ, I don't believe the ISP could possibly be the issue (the circuit is clean and stable) as they don't filter any of our packets. There are no ACLs applied to these interfaces. The 3845 does have other EIGRP neighbors from sites over a TLAN around here in SoCal.
Why the Hellos may not be reaching the 3845? I have verified they're being sent from the 7206.
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Jan 24, 2011
I have a problem with spurious loss of EIGRP neighbour relationships following the introduction of some IOS 15.1(x) into our network. Here's a rough diagram of the topology in question.
Core sites - summarising out RFC 1918 address space to branch. Core routers are 7206s running 12.4(24)T3
Branch has a fractional Ethernet primary link (4Mbit/s) and 4 private ADSLs using CEF load-balancing (per packet) as a backup link (bandwidth 2Mbit/s to branch, 1Mbit/s to core) These links are on separate routers connected at 100Mbit/s. This topology has been in place for some years without issue.
We've recently started putting in 2900 series routers running IOS 15.1(x) instead of 2811s running 12.4(x) in the 2nd buildings - Routers X and W in the diagram. Following that change we're seeing regular loss of EIGRP neighbours on the ADSL links, errors logged as folllows;
Jan 24 16:30:14.192 UTC: %DUAL-5-NBRCHANGE: EIGRP-IPv4 2: Neighbor 10.121.31.114 (ATM0/0/0.1) is down: retry limit exceededJan 24 16:30:16.852 UTC: %DUAL-5-NBRCHANGE: EIGRP-IPv4 2: Neighbor 10.121.31.114 (ATM0/0/0.1) is up: new adjacency
EIGRP packet debugging indicates that router X is periodically attempting to send an EIGRP update to router B. Router B does not log receipt of this update, consequently does not acknowledge it, router X tries 16 times and tears down the neighbour relationship. It's brought back up a varying but small number of seconds later with the exchange of EIGRP hellos - which seem to be fine throughout.
I've been able to reproduce the problem as described by upgrading a working 2811 running 12.4(13a) to 15.1(3)T with no change in config. Downgrading it back to 12.4 again removes the problem. In fact, when running 12.4 the normal state is for no EIGRP updates to be generated by router X. I can contrive to force an update by configuring static routes on routers W,Y or Z and the updates are exchanged and acknowledged normally between router X and router B. If I shut down router X's LAN connections to router W and the adjacent switch, so router X becomes just a spoke on its ADSL links, the problem does not occur.
We only see the problem on ADSL links right now, I'm unable to confirm yet whether we'd see the same if it were another shaped Ethernet link connecting the 2nd building to the core.
The problem is also apparent when running IOS 15.0(1)M3 on router X.
I've gone through the Bug Report list on CCO and not found anything similar to this. The only documented significant difference in EIGRP defaults I can find between IOS 12.4 and 15.x is that no auto-summary is now default.That's not relevant here though because we explicitly turn it off in IOS 12.4.
So, what I could try to make EIGRP operate seamlessly with older IOSs on 15.x.
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Dec 4, 2012
I am having a hard time getting tunnel fail over working. My setup is illustrated below:
I derive my default route on the border routers. The 6513 peers with the 7206's using BGP to get the default route from each ISP into the core. On the core I use BGP weighting to get my primary default to point to ISP1. So far so good. When I look at my core I see to defaults with ISP1 preferred.
Each ASA has an IP Sec tunnel to the head end site configured (Not shown). The head end site has a crypto map entry with ISP1 and ISP2 defined (in that order) using the "set peer" command.
Fail over works great if an ISP drops the connection or my 7206 or ASA fails, but... While testing fail over I had an issue where both tunnels would be active and there were issues with traffic between sites. I could not determine the root cause. I can only guess that some traffic was going out one tunnel and when trying to come back across the other tunnel was dropped from the firewall because there was no connection built for it. After reading I found that in order to use multiple peers in the "set peer" statement, I needed to configure my head end as "originate-only". I have not done this yet as I have concerns. If the head end site is "originate-only" and the tunnel, for whatever reason drops, I cannot wait for interesting traffic at the head end site bound for this site to bring up the tunnel as most of the traffic originates at this site.
I have been reading about IKE keep alives and DPD but that doesn't sound like it will re-initiate the tunnel. Is this correct? If so I'm looking for a way to make this work.
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May 15, 2012
I have used EIGRP with the variance command for years. Recently we swapped out our 6513 for 2 Nexus 7K's and lost the variance command. So now I'm stuck running our two MPLS routers to a 3750 which then connects to the 7K's, so I can get the unequal load balancing back in operation.So because I can't play with it while it's in production I'm using dynamips to simulate the configs. The problem is I'm not able to get a traffic share count ratio that reflects the actual difference in bandwidth.
The two lines have 155 MB and 45 MB respectively, for a ratio of 3.4. Now you can't really send ".4" of a packet but the total packet ratios when dividing the traffic share count should be similar. I'd settle for 3. I was able to get 2.9 in the past but now on the simulator I can't even get that. I'm seeing traffic share counts like 120:89 and 120:71 depending on how I fudge the metrics when I inject the routes from BGP.
I found this link: [URL] a stellar article by the way, and this guy is doing calculations to arrive at a 5:1. BUT when I apply the same formula using specifics from my network and the desired ratio of 3:1 what I get is an AD so high that the route is no longer feasible. I simply cannot make a ratio fo 3:1 using the formula. How to be able to make anything other than a marginal ratio actually work or is this all just theoretical?
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Aug 1, 2007
I am running a network comprising of Catalyst 6513's with SUP7203B's. at present we have 800 VLAN's as we make use of a VLAN per access layer switch model.
I know have a problem that as soon as I enable multicast routing my SUP720's CPU runs at 100% and the system goes into a slowdown.where I can find information on the scalability of Multicast?
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Sep 3, 2012
I am working on Multicast scenario, There is one 6513E switch one 2960 switch. Two VRF's are configured in core switch (6513) IPTV-SRV and Villa-VRF IPTV-SRV vrf has IPTV server and Villa-VRF has IPTV i.e. client.
V LAN 30 is mapped to IPTV-SRV vrf with subnet address 192.168.30.0/24
V LAN 12 is mapped to Villa-VRF with sub net address 192.168.12.0/24
I did the following configuration for VRF but its not working . i am not an expert in multicast design but seems i did most of the configs.
ip vrf IPTV-SRV
rd 30:1
mdt default 232.1.1.1
route-target export 30:1
route-target import 10:1
[code]...
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Dec 6, 2009
I am trying to make the multicast working between few hosts inside a single vlan. Host are running mysql cluster and Multicast is used to send master/slave status information to the IP 228.10.10.10 on port 45566.The vlan is defined in FWSM and the host are connected via the core-switch(6513). (hosts-->core-sws--->fwsm)I have tried searching the documentation, but couldn't find specific info to enable multicast between hosts residing in same vlan. FWSM is running code 3.1(4). since the hosts are residing in the same vlan, I am thinking of applying the <multicast-routing> just for that SVI in FWSM.
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Oct 2, 2011
I have a major problem regarding implementing IP Multicast in an ADSL network. The diagram of our network is attached. In every Access Network , there is only IP DSLAMs which are connected via Metro ethernet links ( L2 links) to the main site. So there is no Router or Layer 3 Link to the main site. In the main site there is an Aggregator router which is an PPPOE server which terminates subscriber's PPPOE sessions. All the Access networks and subscribers are just connected to one Aggregator and they use that one as PPPOE server. It is an Cisco 3845 Router. Then the Aggregator is connected to Core network and behind the Core network is an Streaming server which streams in Multicast. IP Multicast Routing is configured in Spars-Dense mode in all routers in Core network and also the Aggregator and it is working properly. So the sucscribers are able to join the multicast stream and the very last router in the path toward the subscribers( which is the Aggregator) does the Multicast replications.
There are two problems we faced:
1- Since all the subscribers from different Access Network use the same Aggregator in the central site as PPPOE Server, all the connection are terminated on that router. The goal is to use the uplink bandwidth of the Access networks to the central site more efficiently and if e.g 20 subscribers watches the same channel, it just consumes as the amount of one channel due to doing IP Multicast.Now the problem is that when for example 2 subscribers of the same Access Network (in the same POP site) connect to the same stream, the amount of bandwidth used between the central site and the Access network is double. It happens because the aggregator activates IGMP on every virtual-access lines for every PPPOE subscribers who wants to joint the stream. So it can not recognized these two subscribers are from the same Access network. Therefore, the result is that although it is doing Multicast, it does not save the bandwidth because it activates IGMP group on every subscriber's virtual access line for his PPPOE connection. So is there any solution to this problem? Something came to my mind that we need to implement a separate aggregator for every Access network which means that we have to place a router for every access site and it will be expensive for us. But I think in that case every local aggregator can do IP Multicat routing and it saves the bandwidth definitely. Any better solution that may solve our problem using the same topology?
2- Another problem is that when the subscriber's CPE are configured in bridge mode and subscribers set-up a PPPOE connection on their PCs, they are able to join the multicast stream properly. But when they put their CPE in router mode and have their ADSL modems as PPPOE client, they are not able to join the Multicast stream. i.e the ADSL modem is doing NAT and routing and it connects to PPPOE server using username/password credentials. I also tried a feature in ADSL modems called "IGMP support" when I wanted to create the WAN settings. But it did not work. I am not sure but I think that we need "IGMP Proxy" feature on subscriber's CPE.
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Feb 16, 2012
I have two Cisco 3845 routers which receive a multicast stram via a tunnel interface, i.e Tunnel163 (PIM Dense mode is enabled). These routers are both connected to a LAN segment (FastEthernet0/1/0) where receivers are. [code] Router1 is the assert winner (highest IP address), it sees igmp joins request, but it's pruning the interface. It happens sometimes and it lasts until I manually issue clear ip mroute.Unfortunately I cannot migrate to Sparse Mode.
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Oct 29, 2012
we have a chassis 6513-E and a module WS-X6748-GE-TX, I'd like to know if could I put this module in any slot, since the documentation from Cisco says that any slot from a chassis 6500-E Series can support this module. And then in the documentation of WS-X6748-GE-TX says that this module is not compatible in the slots 1-8 of the 6513 chassis, only from 9th to 13th slots, in those slots from the 6513-E we already have 4x WS-X6748-GE-TX, and we'd like to know if could we put the module in the rest of the slots. The 6513, and 6513-E is kind of confusing.
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May 10, 2012
We have a switch that continues to get unidirectional links. The fiber run is very long and is working off of legacy infrastructure. We have one uplink that can sustain 100MBPS trunk link. However, the moment we plug in the second redundant uplink the port will error disable for unidirectional link. We have tested all of the patch cables involved on the run, replaced the catalyst 3560 v2 switch, and even had a contractor come and out verify the fiber was good between the buildings. No matter what the link will come back as unidirectional. Or any troubleshooting steps we could try next? We have UDLD port aggressive enabled on both the switch interface and the interface on our distro router.
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Aug 22, 2012
I have a Ciso L3 switch with 4 VLANs and all host computer connected to rest of 8 cisco 2960 switch's:
VLAN 1 : 192.168.1.0/24
VLAN 10: 192.168.10.0/24
VLAN 20: 192.168.20.0/24
VLAN 50: 192.168.30.0/24
There are list of my some Questions about Extended ACL serialwise :
1. For Restrict traffic from VLAN 10 to VLAN 20, I am using only one ACL is : Access-list 100 deny ip 192.168.10.0 0.0.0.255 192.168.20.0 0.0.0.255.\ What will happen in this scenerio if we talk about traffic from VLAN 20 to VLAN 10. Will it communicate or not ???
2. How to Block the traffic from VLAN 10 to VLAN 20 but allow the traffic from VLAN 20 to VLAN 10 ?
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Apr 18, 2012
Why do we need MP-BGP (and not BGP) to exchange multicast prefixes between multicast domains?
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Feb 19, 2013
I try to pass multicast traffic between two vrf on the same 3750 switch. I have IP services IOS and sdm template routing.
here is my config:
ip routing
!
ip vrf vpn2
rd 1:1
mdt default 232.1.1.1
route-target export 1:1
route-target import 1:1
[code]....
Now I'm stuck - I don't know what to do to pass multicast traffic. Do I have any chance to run this config on 3750 chassis?Perhaps "Configuring Multicast VPN Extranet Support" document will be useful, but it concerns Catalyst 6500? [URL]
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Dec 10, 2012
Is there any physical or technical diferrences between PWR-3845 AC/2 and PWR-3845 AC? We are trying to order replacement parts and wondering if PWR-3845 AC is for one power supply and AC/2 means you get two with one order?
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Dec 7, 2012
Is there any physical or technical diferrences between PWR-3845 AC/2 and PWR-3845 AC? We are trying to order replacement parts and if PWR-3845 AC is for one power supply and AC/2 means you get two with one order.
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Feb 9, 2011
SSH is not working in Cisco 7206 VXR Router. I have configure
Hostname
Ip Domain name
Crypto key generate RSA
IN Line VTY 0 4
transport input preferred SHH
transport input telnet SHH
But stll it is not working. I am getting invalid crc recieved in packet.
Current IOS running is 12.3 (19) Enterprise 3des
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May 12, 2011
I have two 7206 VXR routers with the VPN Service Adapter either side of a leased line (i.e. no provider between, pure layer two connectivity)A requirement is that traffic traversing the link is encrypted so I've configured an IPSec VPN between the two endpoints.During load testing we noticed a very severe performance hit when the VPN was enabled, disabling it again saw we were able to use almost 100% of the 1000Mbs line. The performance hit looks to be due to the increased MTU size when using IPSec, possible due to fragmentation.
I've read that the 7206 VXR can support 980Mbs (or there abouts) of throughput using AES providing the MTU size is 1400.Configuring this manually on each server in each data centre isn't feasible.As the link is effectively a point to point and we have control over the MTU size between the two routers, what options are available to increase the performance when the VPN is enabled?
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Mar 2, 2011
I am attaching my current network topology, My problem is that i am having mpls & p2p link terminated on the 7206 router left side of diagram. now my problem is if i apply PBR on this 7206 router & tracer any host which are on right side of the diagram, it drops on IP 10.1.1.1..ideally it should go to my Core switch on right of the diagram.
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Feb 24, 2011
I am having a Cisco 7406 VXR router. I want to know what is the max. MPLS link capacity that can be terminated on the link? We are planning to upgrade the MPLS link to 450 Mb..so was just wondering whether 7206 will support or not..
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Mar 9, 2011
I have a problem in understanding how LLQ is implemented in different platforms of Cisco.QoS should kick in only when there is a congestion in the link irrespective of queueing / scheduling (LLQ and CBWFQ).But in certain platforms like GSR and IOS-XR, LLQ is confiugred only with priority and police command not with "prioirity percent <value>" command. In priority and police command since policer is used, LLQ is always on even there is no period of congestion. Of course with police you can re-mark the exceed traffic to different marking but thats not the requirement in my case.
In platforms like 7206, LLQ is configured with "prioirty percent <value>" which works ideally only when there is a period of congestion. When there is no congestion, LLQ class can use scanvenge other classes as well.Would like to know is there any specific reason why there is a difference in the implentation of LLQ between different platforms of Cisco.
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Mar 14, 2012
I need to upload IOS c7200-advipservicesk9-mz.124-15.T16.binin 7206 NPE 400 router , As per cisco recommendation router should have DRAM : 256 MB ; Flash : 64I think my router contain only DRAM= 128 MB but not sure.
how much DRAM & Flash it contains.
Router1#sh versionCisco Internetwork Operating System SoftwareIOS (tm) 7200 Software (C7200-IK9S-M), Version 12.3(1a), RELEASE SOFTWARE (fc1)Copyright (c) 1986-2003 by cisco Systems, Inc.Compiled Thu 05-Jun-03 20:58 by dchihImage text-base: 0x60008954, data-base: 0x61E0C000
[Code].....
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Mar 9, 2013
I'm getting below error on 7206VXR (NPE-G1) with IOS "c7200-js-mz.124-3i.bin".Attempt to use contiguous buffer as scattered.[code]
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Mar 27, 2013
How can I enable Console port in 7206 vxr with NPE-G2 card installed, I need to use console from NPE G2 card.
The device turns on and status is also UP and I can also telnet to the device but I am not able to access the device through console port...
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Oct 1, 2012
i did in past a lot of L2TP connection between two end point. in this case ans with 2911 series with ios 15 and DATA license Activated. the l2tp session does not establishe between a this 2911 and 7209. Attached is topology file and bellow the configuration of both router.
PE 2911
l2tp-class l2-dyn
authentication
password 123456
[Code]....
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Mar 4, 2012
I have a lot of cisco 7206 vxr deviceses. I have a high cpu problem.I have a 7206 vxr g2. I used to use ebgp for three upstream carrier. I used to bgp full route table method. I have about 800 Mbps active traffics and behing the router about 1600 active customers.
How can I trouble shoot this high cpu problem?
#sh int gigabitEthernet 0/1
GigabitEthernet0/1 is up, line protocol is up
Hardware is MV64460 Internal MAC, address is 000c.cf1d.d01b (bia 000c.cf1d.d01b)
Description: ***** GW Interface *****
[Code]....
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Apr 24, 2012
In Cisco 7206 VXR (NPE-G2) router , the CPU utilization is at an 80-90% always , but none of the process is consuming not more than 1%. In the show stacks output we are observing network interface interrupt is called very frequently. so what does network interface interrupt is about. Logs for the reference: show process CPU sorted
CPU utilization for five seconds: 88%/88%; one minute: 89%; five minutes: 89%
PID Runtime(uS) Invoked u Secs 5Sec 1Min 5Min TTY Process
1 0 72 0 0.00% 0.00% 0.00% 0 Chunk Manager
2 20020000 17159 1166 0.00% 0.02% 0.01% 0 Load Meter
[Code]...
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Jan 18, 2012
I have a scenario with a Cisco 6506 and a 7206. The 6506 is running BGP and peers with our data center router. The 7206 is a stub router off the 6506 and is used as an edge router for customer T1 circuits. I want to use OSPF between the routers to exchange connected and static routes. The problem I have is that static BGP null routes on the 6506 are overriding the OSPF routes being received from the 7206. Example: The 6506 is advertising a class C network 192.168.1.0/24 to our data center. The 6506 does not utilize the 192.168.1.0/24 network. It is only used on the 7206 for customer T1 circuits and is carved up into /29 subnets. So the 6506 has a static route: ip route 192.168.1.0 255.255.255.0 null 0. Today the routing is accomplished with static routes on the 6506 for the 192.168.1.0 networks on the 7206. Using OSPF the 7206 advertises /29 links back to the 6506, but when I withdraw one of the /29 static routes from the 6506, the /24 null route takes precedence over the more specific /29 routes and the traffic is black-holed on the 6506. how can I get the OSPF routes to look preferable to the /24 null route on the 6506?
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May 22, 2011
I would like to find out what the status is of the Cisco 7204 VXR and 7206 VXR routers?I understand they are EOLife and EOSale.Are they also EOSupport? we planning to upgrade 3 of them in our environment and management requires feedback around this.We thinking of going the ASR1000 route..
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Jun 17, 2013
One of end costumers is trying to configure IP Accounting on 7206 running version 12.4(4)XD8,The issue we are having is that while the physical interface is up (the sub interface is part of a metro line which is directly connected) we dont see packets being accounted if the destination IP is down.
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May 14, 2012
We have a router (7206) which connected to client device in /30 IP segment, but this device is a switch which connected to many more devices. Doing packet capture on our router interface unravel many ARP requests whcih comes from the client switch. Is there any feature or command which we can stop this?
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Apr 4, 2012
I have an outside 7206 router that is configured with BGP. Behind that I have an ASA 5520 with a failover. Everytime my primary ISP goes down I have to failover the ASA to restablish a connection to the secondary ISP. When the primary comes back on line I have to fail it over again. I have had Cisco TAC look at the ASA and they didn't see anything misconfigured on the ASA. Doesn't seem to be any problems with the router config either.
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Dec 5, 2010
What is the maximum number of multilinks we can have on a 7206 router ?
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